223.218.32.0/21

Public

Class C — /21 prefix — 2,046 usable hosts

Network Address

223.218.32.0

Broadcast Address

223.218.39.255

Subnet Mask

255.255.248.0

Usable Hosts

2,046

First Usable IP

223.218.32.1

Last Usable IP

223.218.39.254

Total IPs

2,048

Prefix Length

/21

Network address — the base address of the block (223.218.32.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 223.218.39.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 2,046 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.248.0 is the dotted-decimal equivalent of /21. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	223.218.32.0/21
Network Address	223.218.32.0
Broadcast Address	223.218.39.255
Subnet Mask	255.255.248.0
Wildcard Mask	0.0.7.255
Prefix Length	/21
IP Address Class	Class C
Total IP Addresses	2,048
Usable Host Addresses	2,046
First Usable IP	223.218.32.1
Last Usable IP	223.218.39.254
Network (Hex)	0xDFDA2000
Broadcast (Hex)	0xDFDA27FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

11011111.11011010 11011111.11011010.00100000.00000000

Subnet Mask

11111111.11111111.11111000.00000000

The first 21 bits (1s in the mask) identify the network. The remaining 11 bits identify hosts within the network.

Split into Equal Subnets

Split 223.218.32.0/21 into 2 equal /22 subnets (1,022 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	223.218.32.0/22	223.218.32.0	223.218.32.1	223.218.35.254	223.218.35.255	1,022
2	223.218.36.0/22	223.218.36.0	223.218.36.1	223.218.39.254	223.218.39.255	1,022

Split 223.218.32.0/21 into 4 equal /23 subnets (510 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	223.218.32.0/23	223.218.32.0	223.218.32.1	223.218.33.254	223.218.33.255	510
2	223.218.34.0/23	223.218.34.0	223.218.34.1	223.218.35.254	223.218.35.255	510
3	223.218.36.0/23	223.218.36.0	223.218.36.1	223.218.37.254	223.218.37.255	510
4	223.218.38.0/23	223.218.38.0	223.218.38.1	223.218.39.254	223.218.39.255	510

Split 223.218.32.0/21 into 8 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	223.218.32.0/24	223.218.32.0	223.218.32.1	223.218.32.254	223.218.32.255	254
2	223.218.33.0/24	223.218.33.0	223.218.33.1	223.218.33.254	223.218.33.255	254
3	223.218.34.0/24	223.218.34.0	223.218.34.1	223.218.34.254	223.218.34.255	254
4	223.218.35.0/24	223.218.35.0	223.218.35.1	223.218.35.254	223.218.35.255	254
5	223.218.36.0/24	223.218.36.0	223.218.36.1	223.218.36.254	223.218.36.255	254
6	223.218.37.0/24	223.218.37.0	223.218.37.1	223.218.37.254	223.218.37.255	254
7	223.218.38.0/24	223.218.38.0	223.218.38.1	223.218.38.254	223.218.38.255	254
8	223.218.39.0/24	223.218.39.0	223.218.39.1	223.218.39.254	223.218.39.255	254

Split 223.218.32.0/21 into 16 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	223.218.32.0/25	223.218.32.0	223.218.32.1	223.218.32.126	223.218.32.127	126
2	223.218.32.128/25	223.218.32.128	223.218.32.129	223.218.32.254	223.218.32.255	126
3	223.218.33.0/25	223.218.33.0	223.218.33.1	223.218.33.126	223.218.33.127	126
4	223.218.33.128/25	223.218.33.128	223.218.33.129	223.218.33.254	223.218.33.255	126
5	223.218.34.0/25	223.218.34.0	223.218.34.1	223.218.34.126	223.218.34.127	126
6	223.218.34.128/25	223.218.34.128	223.218.34.129	223.218.34.254	223.218.34.255	126
7	223.218.35.0/25	223.218.35.0	223.218.35.1	223.218.35.126	223.218.35.127	126
8	223.218.35.128/25	223.218.35.128	223.218.35.129	223.218.35.254	223.218.35.255	126
9	223.218.36.0/25	223.218.36.0	223.218.36.1	223.218.36.126	223.218.36.127	126
10	223.218.36.128/25	223.218.36.128	223.218.36.129	223.218.36.254	223.218.36.255	126
11	223.218.37.0/25	223.218.37.0	223.218.37.1	223.218.37.126	223.218.37.127	126
12	223.218.37.128/25	223.218.37.128	223.218.37.129	223.218.37.254	223.218.37.255	126
13	223.218.38.0/25	223.218.38.0	223.218.38.1	223.218.38.126	223.218.38.127	126
14	223.218.38.128/25	223.218.38.128	223.218.38.129	223.218.38.254	223.218.38.255	126
15	223.218.39.0/25	223.218.39.0	223.218.39.1	223.218.39.126	223.218.39.127	126
16	223.218.39.128/25	223.218.39.128	223.218.39.129	223.218.39.254	223.218.39.255	126

/21 Subnet Reference

Total IPs 2,048

Usable Hosts 2,046

Subnet Mask 255.255.248.0

Wildcard 0.0.7.255

Full /21 reference →

Related Ranges

Parent /20 block 223.218.32.0/20 Sibling /21 block 223.218.40.0/21

Adjacent Prefix Sizes

/19 8,190 hosts /20 4,094 hosts /21 2,046 hosts /22 1,022 hosts /23 510 hosts